RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

Mathematics (Maths) Class 6

Class 6 : RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

The document RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev is a part of the Class 6 Course Mathematics (Maths) Class 6.
All you need of Class 6 at this link: Class 6

Q.1. Estimate each of the following using general rule:

(a) 730 + 998 

(b) 796 − 314 

(c) 12, 904 + 2, 888

(d) 28, 292 − 21, 496

Make ten more such examples of addition, subtraction and estimation of their outcome.

Ans: 

(a) 730 + 998

By rounding off to hundreds, 730 rounds off to 700 and 998 rounds off to 1000.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(b) 796 − 314

By rounding off to hundreds, 796 rounds off to 800 and 314 rounds off to 300.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(c) 12904 + 2822

By rounding off to thousands, 12904 rounds off to 13000 and 2822 rounds off to 3000.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(d) 28,296 − 21,496

By rounding off to nearest thousands, 28296 rounds off to 28000 and 21496 rounds off to 21000.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev


Q.2. Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens):

(a) 439 + 334 + 4, 317 

(b) 1,08, 734 − 47, 599 

(c) 8325 − 491

(d) 4, 89, 348 − 48, 365

Make four more such examples.

Ans: 

(a) 439 + 334 + 4317

Rounding off to nearest hundreds, 439, 334, and 4317 may be rounded off to 400, 300, and 4300 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

Rounding off to nearest tens, 439, 334, and 4317 may be rounded off to 440, 330, and 4320 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(b) 1,08,734 − 47,599

Rounding off to hundreds, 1,08,734 and 47,599 may be rounded off to 1,08,700 and 47,600 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

Rounding off to tens, 1,08,734 and 47,599 may be rounded off to 1,08,730 and 47,600 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(c) 8325 − 491

Rounding off to hundreds, 8325 and 491 may be rounded off to 8300 and 500 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

Rounding off to tens, 8325 and 491 may be rounded off to 8330 and 490 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(d) 4,89,348 − 48,365

Rounding off to hundreds, 489348 and 48365 may be rounded off to 489300 and 48400 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

Rounding off to tens, 489348 and 48365 may be rounded off to 489350 and 48370 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev


Q.3. Estimate the following products using general rule:

(a) 578 × 161 

(b) 5281 × 3491

(c) 1291 × 592 

(d) 9250 × 29

Ans: 

(a) 578 × 161

Rounding off by general rule, 598 and 161 may be rounded off to 600 and 200 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(b) 5281 × 3491

Rounding off by general rule, 5281 and 3491 may be rounded off to 5000 and 3000 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(c) 1291 × 592

Rounding off by general rule, 1291 and 592 may be rounded off to 1000 and 600 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

(d) 9250 × 29

Rounding off by general rule, 9250 and 29 may be rounded off to 9000 and 30 respectively.

RD Sharma Solutions: Exercise 1.3- Knowing Our Numbers Class 6 Notes | EduRev

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